MATCH-VARS:
Pattern matching

Next:

match ( value1 value2 -- bindings )

Vocabulary
match

Syntax

MATCH-VARS: var ... ;

Inputs
None

Outputs
None

Word description
Creates a symbol that can be used in match and match-cond for binding values in the matched sequence. The symbol name is created as a word that is defined to get the value of the symbol out of the current namespace. This can be used in match-cond to retrive the values in the quotation body.

Examples

USE: match MATCH-VARS: ?value ; { increment 346126 } { { { increment ?value } [ ?value do-something ] } { { decrement ?value } [ ?value do-something-else ] } { _ [ no-match-found ] } } match-cond

See also
match, match-cond, replace-patterns, match-replace

Definition

USING: lexer ;

IN: match

SYNTAX: MATCH-VARS: ";" [ define-match-var ] each-token ;